"Jay Beckman" wrote in message
news:_tZBc.7933$5t2.5921@fed1read01...
"Paul Sengupta" wrote in message
...
"Tony Cox" wrote in message
ink.net...
Assuming the mode C is properly calibrated, that is.

How do you measure altitude at 328k feet? Surely a standard
barometric device isn't going to work?

Paul



Ground based radar? Inertial telemetry? GPS?

Good question...

Jay B in AZ

Rutan answered it with "...these data come from the inertial nav
system."